Apply the difference of angles identity.

Simplify each term.

The exact value of is .

Multiply by .

The exact value of is .

Multiply by .

Add and .

Expand cos(pi/2-x)

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# Expand cos(pi/2-x)

Apply the difference of angles identity.

Simplify each term.

The exact value of is .

Multiply by .

The exact value of is .

Multiply by .

Add and .

Expand cos(pi/2-x)